WO2021159456A1 - Informations de structure temporelle d'occupation de canal (cot-si) pour de multiples points d'émission-réception (trps) - Google Patents

Informations de structure temporelle d'occupation de canal (cot-si) pour de multiples points d'émission-réception (trps) Download PDF

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Publication number
WO2021159456A1
WO2021159456A1 PCT/CN2020/075240 CN2020075240W WO2021159456A1 WO 2021159456 A1 WO2021159456 A1 WO 2021159456A1 CN 2020075240 W CN2020075240 W CN 2020075240W WO 2021159456 A1 WO2021159456 A1 WO 2021159456A1
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Prior art keywords
trp
cot
lbt
subband
bitmap
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PCT/CN2020/075240
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English (en)
Inventor
Changlong Xu
Jing Sun
Xiaoxia Zhang
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Qualcomm Incorporated
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Priority to PCT/CN2020/075240 priority Critical patent/WO2021159456A1/fr
Publication of WO2021159456A1 publication Critical patent/WO2021159456A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • This application relates to wireless communication systems, and more particularly to multi-transmission-reception point (multi-TRP) operations in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) .
  • multi-TRP multi-transmission-reception point
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • a wireless multiple-access communications system may include a number of base stations (BSs) , each simultaneously supporting communications for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • BSs base stations
  • UE user equipment
  • NR next generation new radio
  • LTE long-term evolution
  • NR next generation new radio
  • 5G 5 th Generation
  • LTE long-term evolution
  • NR next generation new radio
  • NR is designed to provide a lower latency, a higher bandwidth or a higher throughput, and a higher reliability than LTE.
  • NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands.
  • GHz gigahertz
  • mmWave millimeter wave
  • NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrums to dynamically support high-bandwidth services. Spectrum sharing can extend the benefit of NR technologies to operating entities that may not have access to a licensed spectrum.
  • NR is also designed to support multi-connectivity, for example, by utilizing multiple transmission-reception points (TRPs) to improve reliability, coverage, and/or performance capacity.
  • TRPs can be connected via an ideal backhaul or a non-ideal backhaul.
  • An ideal backhaul may refer to a backhaul with a low latency, a high throughput, and/or no error, and thus may allow connected TRPs to closely coordinate with each other to schedule UEs for communications.
  • the TRPs can coordinate with each other to communicate with the UE, for example, using coordinated multipoint (CoMP) transmission/reception techniques and/or joint signal processing techniques to improve reliability, performance, and coverage.
  • CoMP coordinated multipoint
  • a non-ideal backhaul may have a higher delay and/or more errors compared to an ideal backhaul, and thus joint-scheduling among connected TRPs may not be suitable.
  • each TRP may independently schedule a data stream with the UE and simultaneously communicate the data streams with the UE to provide a higher capacity.
  • URLLC ultra-reliable low-latency communication
  • IIOT industrial Internet of things
  • a method of wireless communication including transmitting, by at least one of a first transmission-reception point (TRP) of a network or a second TRP of the network, an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP; and communicating, with a user equipment (UE) , at least one of a first communication signal in the first LBT subband by the first TRP; or a second communication signal in the second LBT subband by the second TRP.
  • TRP transmission-reception point
  • LBT listen-before-talk
  • a method of wireless communication including receiving, by a user equipment (UE) from at least one of a first transmission-reception point (TRP) of a network or a second TRP of the network, an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP; and communicating, by the UE, at least one of a first communication signal in the first LBT subband with the first TRP; or a second communication signal in the second LBT subband with the second TRP.
  • UE user equipment
  • TRP transmission-reception point
  • LBT listen-before-talk
  • a network system including a first transmission-reception point (TRP) including a first transceiver; and a second TRP including a second transceiver, where at least one of the first transceiver of the first TRP or the second transceiver of the second TRP is configured to transmit an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP, and where at least one of the first transceiver of the first TRP is configured to communicate, with a user equipment (UE) , a first communication signal in the first LBT subband; or the second transceiver of the second TRP is configured to communicate, with the UE, a second communication signal in the second LBT subband.
  • LBT listen-before-talk
  • a user equipment including a transceiver configured to receive, from at least one of a first transmission-reception point (TRP) of a network or a second TRP of the network, an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP; and communicate at least one of a first communication signal in the first LBT subband with the first TRP; or a second communication signal in the second LBT subband with the second TRP.
  • TRP transmission-reception point
  • LBT listen-before-talk
  • a non-transitory computer-readable medium having program code recorded thereon, the program code including code for causing at least one of a first transmission-reception point (TRP) of a network or a second TRP of the network to transmit an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP; and code for causing at least one of the first TRP to communicate, with a user equipment (UE) , a first communication signal in the first LBT subband; or the second TRP to communicate, with the UE, a second communication signal in the second LBT subband.
  • TRP transmission-reception point
  • LBT listen-before-talk
  • a non-transitory computer-readable medium having program code recorded thereon, the program code including code for causing a user equipment (UE) to receive, from at least one of a first transmission-reception point (TRP) of a network or a second TRP of the network, an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP; and code for causing the UE to communicate at least one of a first communication signal in the first LBT subband with the first TRP; or a second communication signal in the second LBT subband with the second TRP.
  • TRP transmission-reception point
  • LBT listen-before-talk
  • a network system including a first transmission-reception point (TRP) ; and a second TRP, where at least one of the first TRP or the second TRP includes means for transmitting an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP, and where at least one of the first TRP includes means for communicating, with a user equipment (UE) , a first communication signal in the first LBT subband; or the second TRP includes means for communicating, with the UE, a second communication signal in the second LBT subband.
  • LBT listen-before-talk
  • a user equipment including means for receiving, from at least one of a first transmission-reception point (TRP) of a network or a second TRP of the network, an indication indicating an availability of a first listen-before-talk (LBT) subband of a plurality of LBT subbands in an unlicensed spectrum for communicating with the first TRP; and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP; and means for communicating at least one of a first communication signal in the first LBT subband with the first TRP; or a second communication signal in the second LBT subband with the second TRP.
  • TRP transmission-reception point
  • LBT listen-before-talk
  • FIG. 1 illustrates a wireless communication network according to some aspects of the present disclosure.
  • FIG. 2 illustrates a wireless communication network that utilizes multiple transmission-reception points (TRPs) for communications according to some aspects of the present disclosure.
  • TRPs transmission-reception points
  • FIG. 3 illustrates a multi-TRP channel occupancy time (COT) acquisition scheme according to some aspects of the present disclosure.
  • FIG. 4 illustrates a multi-TRP COT acquisition scheme according to some aspects of the present disclosure.
  • FIG. 5 is a block diagram of a user equipment (UE) according to some aspects of the present disclosure.
  • FIG. 6 is a block diagram of an exemplary base station (BS) according to some aspects of the present disclosure.
  • FIG. 7 is a block diagram of an exemplary TRP according to some aspects of the present disclosure.
  • FIG. 8 illustrates a multi-TRP channel occupancy time-structural information (COT-SI) signaling scheme according to some aspects of the present disclosure.
  • FIG. 9 is a flow diagram of a multi-TRP communication method according to some aspects of the present disclosure.
  • FIG. 10 is a flow diagram of a multi-TRP communication method according to some aspects of the present disclosure.
  • FIG. 11 illustrates a multi-TRP COT-SI signaling scheme according to some aspects of the present disclosure.
  • FIG. 12 illustrates a multi-TRP COT-SI signaling scheme according to some aspects of the present disclosure.
  • FIG. 13 illustrates a multi-TRP COT-SI signaling scheme according to some aspects of the present disclosure.
  • FIG. 14 illustrates a multi-TRP COT-SI signaling scheme according to some aspects of the present disclosure.
  • FIG. 15 is a flow diagram of a wireless communication method according to some aspects of the present disclosure.
  • FIG. 16 is a flow diagram of a wireless communication method according to some aspects of the present disclosure.
  • wireless communications systems also referred to as wireless communications networks.
  • the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, Global System for Mobile Communications (GSM) networks, 5 th Generation (5G) or new radio (NR) networks, as well as other communications networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • LTE Long Term Evolution
  • GSM Global System for Mobile Communications
  • 5G 5 th Generation
  • NR new radio
  • An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • GSM Global System for Mobile communications
  • LTE long term evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP)
  • cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 3GPP 3rd Generation Partnership Project
  • 3GPP long term evolution LTE
  • LTE long term evolution
  • the 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices.
  • the present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
  • 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface.
  • further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks.
  • the 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with a ultra-high density (e.g., ⁇ 1M nodes/km 2 ) , ultra-low complexity (e.g., ⁇ 10s of bits/sec) , ultra-low energy (e.g., ⁇ 10+ years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ⁇ 99.9999%reliability) , ultra-low latency (e.g., ⁇ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ⁇ 10 Tbps/km 2 ) , extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.
  • IoTs Internet of things
  • a 5G NR communication system may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI) . Additional features may also include having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments.
  • TTI transmission time interval
  • Additional features may also include having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced
  • subcarrier spacing may occur with 15 kHz, for example over 5, 10, 20 MHz, and the like bandwidth (BW) .
  • BW bandwidth
  • subcarrier spacing may occur with 30 kHz over 80/100 MHz BW.
  • the subcarrier spacing may occur with 60 kHz over a 160 MHz BW.
  • subcarrier spacing may occur with 120 kHz over a 500 MHz BW.
  • the scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency.
  • QoS quality of service
  • 5G NR also contemplates a self-contained integrated subframe design with UL/downlink scheduling information, data, and acknowledgement in the same subframe.
  • the self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL/downlink that may be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet the current traffic needs.
  • an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways.
  • an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein.
  • such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein.
  • a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer.
  • an aspect may comprise at least one element of a claim.
  • a UE can be in communication with a network via multiple transmission-reception points (TRPs) .
  • the network may utilize two approaches to schedule the UE for communications with the multiple TRPs.
  • One approach to scheduling the UE for multi-TRP communications is to utilize one of the multiple TRPs to transmit a single scheduling grant to the UE.
  • the scheduling grant may be transmitted in the form of downlink control information (DCI) via a physical downlink control channel (PDCCH) .
  • the scheduling grant may indicate a DL data transmission in a physical downlink shared channel (PDSCH) from the multiple TRPs.
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the multiple TRPs may cooperatively transmit the single PDSCH transmission to the UE, for example, via spatial-division-multiplexing (SDM) , frequency-division-multiplexing (FDM) , or time-division-multiplexing (TDM) .
  • SDM spatial-division-multiplexing
  • FDM frequency-division-multiplexing
  • TDM time-division-multiplexing
  • This approach may be suitable when the multiple TRPs are connected via an ideal backhaul.
  • An ideal backhaul may refer to a backhaul with a low latency, a high throughput, and/or no error.
  • each TRP may independently transmit a DL scheduling grant or DCI to schedule a DL transmission or PDSCH with the UE.
  • each DCI may schedule one PDSCH transmission from one TRP.
  • This approach can be used when the multiple TRPs are connected via an ideal backhaul or a non-ideal backhaul.
  • a non-ideal backhaul may have a higher latency, lower throughput, and/or a higher error rate than an ideal backhaul.
  • NR may extend multi-TRP operations to deployments in an unlicensed spectrum, for example, to enhance or improve performance for ultra-reliable low-latency communication (URLLC) and/or industrial Internet of things (IIOT) services over an unlicensed spectrum.
  • URLLC ultra-reliable low-latency communication
  • IIOT industrial Internet of things
  • One approach to avoiding collisions when communicating in a shared spectrum or an unlicensed spectrum is to use a listen-before-talk (LBT) procedure to ensure that the shared channel is clear before transmitting a signal in the shared channel.
  • LBT listen-before-talk
  • an unlicensed band can be partitioned into multiple LBT subbands and each TRP may perform an LBT in each LBT subband to contend for a COT in the respective subbands.
  • the TRP may communicate with the UE in the respective LBT subband during the COT.
  • a network or network system may include a first TRP and a second TRP.
  • the network may serve a UE over the shared radio frequency band via the first TRP and the second TRP.
  • the shared radio frequency band may be partitioned into a plurality LBT subbands.
  • Each of the first TRP and the second TRP may perform an LBT in each LBT subband of the plurality of LBT subbands to acquire or contend for a COT in a respective LBT subband for communication with a UE.
  • the first TRP may simultaneously perform an LBT in each LBT subbband and the second TRP may simultaneously perform an LBT in each LBT subband.
  • the first TRP and the second TRP may operate in a coordinated start mode, where the first TRP and the second TRP may perform the LBTs in the LBT subbands at the same time, and a COT acquired by the first TRP and a COT acquired by the second TRP may start at the same time and may have the same COT duration.
  • the first TRP and the second TRP may operate in an unconstrained start mode, where the first TRP and the second TRP may perform the LBTs in the LBT subbands separately, for example, at different LBT start times, and thus a COT acquired by the first TRP and a COT acquired by the second TRP may have different COT start times and/or different COT durations.
  • each of the first TRP and the second TRP may separately transmit COT-SI to indicate which of the LBT subbands that the corresponding first TRP or second TRP passes an LBT and successfully acquires a COT.
  • the first TRP may transmit first COT-SI including a first bitmap, where each bit in the first bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available (e.g., with an acquired COT) for communicating with the first TRP.
  • the second TRP may transmit second COT-SI including a second bitmap, where each bit in the second bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • the first TRP or the second TRP may transmit COT-SI including both the first bitmap and the second bitmap.
  • the first TRP or the second TRP may combine the first bitmap and the second bitmap and include the combined bitmap in the COT-SI.
  • each of the first TRP and the second TRP may separately indicate, in COT-SI, a COT duration for COT (s) acquired by the corresponding first TRP or second TRP.
  • COT (s) acquired by the first TRP and COT (s) acquired by the second TRP may have the same COT duration.
  • one of the first TRP and the second TRP may indicate a common COT duration for COT(s) acquired by the first TRP and COT (s) acquired by the second TRP.
  • both the first TRP and the second TRP may separately indicate the common COT duration to increase robustness.
  • one of the first TRP or the second TRP may transmit COT-SI indicating a COT duration for COT (s) acquired by the first TRP and a COT duration for COT (s) acquired by the second TRP.
  • aspects of the present disclosure can provide several benefits. For example, the provisioning of the coordinated start mode, the unconstrained start mode, the separate COT-SI signaling from each TRP, and/or the combined COT-SI signaling from one TRP provide flexibility in deploying multi-TRP over an unlicensed band. For instance, when TRPs are located close to each other, their transmissions may potentially block each other’s LBTs, and thus the coordinated start mode may be applied to avoid such LBT blockages among closely-located TRPs.
  • the unconstrained start mode allows each TRP serving the same UE to have the flexibility of performing LBTs and contending for COTs independently.
  • the TRPs When the TRPs are connected via a non-ideal backhaul, there may be delays and/or errors in the communications among the TRPs.
  • the separate COT-SI signaling from each TRP allows TRPs that are connected via a non-ideal backhaul to separately transmit COT-SI instead of impacted by the non-ideal backhaul.
  • the combined COT-SI signaling allows one TRP to signal COT-SI for all TRPs serving the same UE.
  • the combined COT-SI signaling can reduce processing complexity at the UEs.
  • FIG. 1 illustrates a wireless communication network 100 according to some aspects of the present disclosure.
  • the network 100 may be a 5G network.
  • the network 100 includes a number of base stations (BSs) 105 (individually labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities.
  • a BS 105 may be a station that communicates with UEs 115 and may also be referred to as an evolved node B (eNB) , a next generation eNB (gNB) , an access point (e.g., an IEEE 802.11 AP) , and the like.
  • Each BS 105 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to this particular geographic coverage area of a BS 105 and/or a BS subsystem serving the coverage area, depending on the context in which the term is used.
  • a BS 105 may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS or a home BS. In the example shown in FIG.
  • the BSs 105d and 105e may be regular macro BSs, while the BSs 105a-105c may be macro BSs enabled with one of three dimension (3D) , full dimension (FD) , or massive MIMO.
  • the BSs 105a-105c may take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity.
  • the BS 105f may be a small cell BS which may be a home node or portable access point.
  • a BS 105 may support one or multiple (e.g., two, three, four, and the like) cells.
  • the network 100 may support synchronous or asynchronous operation.
  • the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time.
  • the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
  • the UEs 115 are dispersed throughout the wireless network 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • a UE 115 may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, an IEEE 802.11 terminal station (STA) , or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • STA IEEE 802.11 terminal station
  • a UE 115 may be a device that includes a Universal Integrated Circuit Card (UICC) .
  • UICC Universal Integrated Circuit Card
  • a UE may be a device that does not include a UICC.
  • the UEs 115 that do not include UICCs may also be referred to as IoT devices or internet of everything (IoE) devices.
  • the UEs 115a-115d are examples of mobile smart phone-type devices accessing network 100.
  • a UE 115 may also be a machine specifically configured for connected communication, including machine type communication (MTC) , enhanced MTC (eMTC) , narrowband IoT (NB-IoT) and the like.
  • MTC machine type communication
  • eMTC enhanced MTC
  • NB-IoT narrowband IoT
  • the UEs 115e-115h are examples of various machines configured for communication that access the network 100.
  • the UEs 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication that access the network 100.
  • a UE 115 may be able to communicate with any type of the BSs, whether macro BS, small cell, or the like.
  • a lightning bolt e.g., communication links indicates wireless transmissions between a UE 115 and a serving BS 105, which is a BS designated to serve the UE 115 on the downlink (DL) and/or uplink (UL) , desired transmission between BSs 105, backhaul transmissions between BSs, or sidelink transmissions between UEs 115.
  • the BSs 105a-105c may serve the UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity.
  • the macro BS 105d may perform backhaul communications with the BSs 105a-105c, as well as small cell, the BS 105f.
  • the macro BS 105d may also transmits multicast services which are subscribed to and received by the UEs 115c and 115d.
  • Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.
  • the BSs 105 may also communicate with a core network.
  • the core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • IP Internet Protocol
  • At least some of the BSs 105 (e.g., which may be an example of a gNB or an access node controller (ANC) ) may interface with the core network through backhaul links (e.g., NG-C, NG-U, etc. ) and may perform radio configuration and scheduling for communication with the UEs 115.
  • the BSs 105 may communicate, either directly or indirectly (e.g., through core network) , with each other over backhaul links (e.g., X1, X2, etc. ) , which may be wired or wireless communication links.
  • the network 100 may also support mission critical communications with ultra-reliable and redundant links for mission critical devices, such as the UE 115e, which may be a drone. Redundant communication links with the UE 115e may include links from the macro BSs 105d and 105e, as well as links from the small cell BS 105f.
  • UE 115f e.g., a thermometer
  • UE 115g e.g., smart meter
  • UE 115h e.g., wearable device
  • the network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such asV2V, V2X, C-V2X communications between a UE 115i, 115j, or 115k and other UEs 115, and/or vehicle-to-infrastructure (V2I) communications between a UE 115i, 115j, or 115k and a BS 105.
  • V2V dynamic, low-latency TDD/FDD communications
  • V2X V2X
  • C-V2X C-V2X communications between a UE 115i, 115j, or 115k and other UEs 115
  • V2I vehicle-to-infrastructure
  • the network 100 utilizes OFDM-based waveforms for communications.
  • An OFDM-based system may partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier may be modulated with data.
  • the subcarrier spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system BW.
  • the system BW may also be partitioned into subbands. In other instances, the subcarrier spacing and/or the duration of TTIs may be scalable.
  • the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RB) ) for downlink (DL) and uplink (UL) transmissions in the network 100.
  • DL refers to the transmission direction from a BS 105 to a UE 115
  • UL refers to the transmission direction from a UE 115 to a BS 105.
  • the communication can be in the form of radio frames.
  • a radio frame may be divided into a plurality of subframes or slots, for example, about 10. Each slot may be further divided into mini-slots. In a FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands.
  • each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band.
  • UL and DL transmissions occur at different time periods using the same frequency band.
  • a subset of the subframes (e.g., DL subframes) in a radio frame may be used for DL transmissions and another subset of the subframes (e.g., UL subframes) in the radio frame may be used for UL transmissions.
  • each DL or UL subframe may have pre-defined regions for transmissions of reference signals, control information, and data.
  • Reference signals are predetermined signals that facilitate the communications between the BSs 105 and the UEs 115.
  • a reference signal can have a particular pilot pattern or structure, where pilot tones may span across an operational BW or frequency band, each positioned at a pre-defined time and a pre-defined frequency.
  • a BS 105 may transmit cell specific reference signals (CRSs) and/or channel state information –reference signals (CSI-RSs) to enable a UE 115 to estimate a DL channel.
  • CRSs cell specific reference signals
  • CSI-RSs channel state information –reference signals
  • a UE 115 may transmit sounding reference signals (SRSs) to enable a BS 105 to estimate a UL channel.
  • Control information may include resource assignments and protocol controls.
  • Data may include protocol data and/or operational data.
  • the BSs 105 and the UEs 115 may communicate using self-contained subframes.
  • a self-contained subframe may include a portion for DL communication and a portion for UL communication.
  • a self-contained subframe can be DL-centric or UL-centric.
  • a DL-centric subframe may include a longer duration for DL communication than for UL communication.
  • a UL-centric subframe may include a longer duration for UL communication than for UL communication.
  • the network 100 may be an NR network deployed over a licensed spectrum.
  • the BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) ) in the network 100 to facilitate synchronization.
  • the BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB) , remaining system information (RMSI) , and other system information (OSI) ) to facilitate initial network access.
  • MIB master information block
  • RMSI remaining system information
  • OSI system information
  • the BSs 105 may broadcast the PSS, the SSS, and/or the MIB in the form of synchronization signal block (SSBs) over a physical broadcast channel (PBCH) and may broadcast the RMSI and/or the OSI over a physical downlink shared channel (PDSCH) .
  • PBCH physical broadcast channel
  • PDSCH physical downlink shared channel
  • a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a BS 105.
  • the PSS may enable synchronization of period timing and may indicate a physical layer identity value.
  • the UE 115 may then receive a SSS.
  • the SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell.
  • the PSS and the SSS may be located in a central portion of a carrier or any suitable frequencies within the carrier.
  • the UE 115 may receive a MIB.
  • the MIB may include system information for initial network access and scheduling information for RMSI and/or OSI.
  • the UE 115 may receive RMSI and/or OSI.
  • the RMSI and/or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH) , physical UL shared channel (PUSCH) , power control, and SRS.
  • RRC radio resource control
  • the UE 115 can perform a random access procedure to establish a connection with the BS 105.
  • the random access procedure may be a four-step random access procedure.
  • the UE 115 may transmit a random access preamble and the BS 105 may respond with a random access response.
  • the random access response (RAR) may include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, a UL grant, a temporary cell-radio network temporary identifier (C-RNTI) , and/or a backoff indicator.
  • ID detected random access preamble identifier
  • TA timing advance
  • C-RNTI temporary cell-radio network temporary identifier
  • the UE 115 may transmit a connection request to the BS 105 and the BS 105 may respond with a connection response.
  • the connection response may indicate a contention resolution.
  • the random access preamble, the RAR, the connection request, and the connection response can be referred to as message 1 (MSG1) , message 2 (MSG2) , message 3 (MSG3) , and message 4 (MSG4) , respectively.
  • the random access procedure may be a two-step random access procedure, where the UE 115 may transmit a random access preamble and a connection request in a single transmission and the BS 105 may respond by transmitting a random access response and a connection response in a single transmission.
  • the UE 115 and the BS 105 can enter a normal operation stage, where operational data may be exchanged.
  • the BS 105 may schedule the UE 115 for UL and/or DL communications.
  • the BS 105 may transmit UL and/or DL scheduling grants to the UE 115 via a PDCCH.
  • the scheduling grants may be transmitted in the form of DL control information (DCI) .
  • the BS 105 may transmit a DL communication signal (e.g., carrying data) to the UE 115 via a PDSCH according to a DL scheduling grant.
  • the UE 115 may transmit a UL communication signal to the BS 105 via a PUSCH and/or PUCCH according to a UL scheduling grant.
  • the BS 105 may communicate with a UE 115 using HARQ techniques to improve communication reliability, for example, to provide a URLLC service.
  • the BS 105 may schedule a UE 115 for a PDSCH communication by transmitting a DL grant in a PDCCH.
  • the BS 105 may transmit a DL data packet to the UE 115 according to the schedule in the PDSCH.
  • the DL data packet may be transmitted in the form of a transport block (TB) . If the UE 115 receives the DL data packet successfully, the UE 115 may transmit a HARQ ACK to the BS 105.
  • TB transport block
  • the UE 115 may transmit a HARQ NACK to the BS 105.
  • the BS 105 may retransmit the DL data packet to the UE 115.
  • the retransmission may include the same coded version of DL data as the initial transmission.
  • the retransmission may include a different coded version of the DL data than the initial transmission.
  • the UE 115 may apply soft-combining to combine the encoded data received from the initial transmission and the retransmission for decoding.
  • the BS 105 and the UE 115 may also apply HARQ for UL communications using substantially similar mechanisms as the DL HARQ.
  • the network 100 may operate over a system BW or a component carrier (CC) BW.
  • the network 100 may partition the system BW into multiple BWPs (e.g., portions) .
  • a BS 105 may dynamically assign a UE 115 to operate over a certain BWP (e.g., a certain portion of the system BW) .
  • the assigned BWP may be referred to as the active BWP.
  • the UE 115 may monitor the active BWP for signaling information from the BS 105.
  • the BS 105 may schedule the UE 115 for UL or DL communications in the active BWP.
  • a BS 105 may assign a pair of BWPs within the CC to a UE 115 for UL and DL communications.
  • the BWP pair may include one BWP for UL communications and one BWP for DL communications.
  • the network 100 may operate over a shared channel, which may include shared frequency bands and/or unlicensed frequency bands.
  • the network 100 may be an NR-U network operating over an unlicensed frequency band.
  • the BSs 105 and the UEs 115 may be operated by multiple network operating entities.
  • the BSs 105 and the UEs 115 may employ a listen-before-talk (LBT) procedure to monitor for transmission opportunities (TXOPs) in the shared channel.
  • LBT listen-before-talk
  • TXOPs transmission opportunities
  • a TXOP may also be referred to as COT.
  • a transmitting node e.g., a BS 105 or a UE 115
  • An LBT can be based on energy detection (ED) or signal detection.
  • ED energy detection
  • the LBT results in a pass when signal energy measured from the channel is below a threshold. Conversely, the LBT results in a failure when signal energy measured from the channel exceeds the threshold.
  • the LBT results in a pass when a channel reservation signal (e.g., a predetermined preamble signal) is not detected in the channel.
  • a channel reservation signal e.g., a predetermined preamble signal
  • an LBT may be in a variety of modes.
  • An LBT mode may be, for example, a category 4 (CAT4) LBT, a category 2 (CAT2) LBT, or a category 1 (CAT1) LBT.
  • a CAT1 LBT is referred to a no LBT mode, where no LBT is to be performed prior to a transmission.
  • a CAT2 LBT refers to an LBT without a random backoff period.
  • a transmitting node may determine a channel measurement in a time interval and determine whether the channel is available or not based on a comparison of the channel measurement against a ED threshold.
  • a CAT4 LBT refers to an LBT with a random backoff and a variable contention window (CW) . For instance, a transmitting node may draw a random number and backoff for a duration based on the drawn random number in a certain time unit.
  • CW variable contention window
  • the network 100 may utilize multiple TRPs to communicate with a UE 115, for example, to increase reliability, coverage, and/or capacity performance.
  • a BS 105 may be coupled to multiple TRPs and may communicate with a UE 115 via the multiple TRPs as discussed below with reference to FIG. 2.
  • FIG. 2 illustrates a wireless communication network 200 that utilizes multiple TRPs for communications according to some aspects of the present disclosure.
  • the network 200 may correspond to a portion of the network 100.
  • FIG. 2 illustrates two TRPs 205 (shown as 205a and 205b) in communication with one UE 215 for purposes of simplicity of discussion, though it will be recognized that embodiments of the present disclosure may scale to many more UEs 215 and/or TRPs 205.
  • the UE 215 may be similar to the UEs 115.
  • Each of the TRPs 205 may include a radio frequency (RF) frontend configured for wireless signal transmissions and receptions.
  • the TRPs 205a and 205b may be coupled to a BS 202 similar to the BSs 105.
  • RF radio frequency
  • the TRP 205a and the TRP 205b may simultaneously communicate with the UE 215 over a communication link 204a and a communication link 204b, respectively.
  • the TRPs 205a and 205b may be co-located with the BS 202.
  • the TRPs 205a and 205b may be located at a remote location spaced apart from each other.
  • the TRPs 205a and 205b may have similar functionalities as a BS 105. For instance, certain BS operations, such as baseband processing and/or protocol processing, may be distributed to the TRPs 205a and 205b. In some other instances, the baseband processing and/or protocol processing may be centralized at the BS 202.
  • the links 204a and 204b may be over a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) .
  • the shared radio frequency band can be partitioned into multiple LBT subbands and each TRP 205a and 205b may perform an LBT in each LBT subband to contend for a COT in the respective subbands.
  • the TRP 205 may communicate with the UE in the respective LBT subband during the COT.
  • the TRPs 205a and the TRP 205b may contend for COTs in the LBT subbands in a coordinated manner.
  • the TRPs 205a and the TRP 205b may start LBTs at the same time and all COTs acquired by the TRPs 205a and the TRP 205b may be time-aligned as will be discussed below with reference to FIG. 3.
  • the coordinated LBT approach may be referred to as a coordinated start mode.
  • the TRPs 205a and the TRP 205b may contend for COTs in the LBT subbands in an uncoordinated manner.
  • the TRPs 205a and the TRP 205b may start LBTs at different times and may have COTs with different starting times and/or different end times as will be discussed below with reference to FIG. 4.
  • the uncoordinated LBT approach may be referred to as an unconstrained start mode.
  • FIGS. 3 and 4 are discussed in relation to FIG. 2 to illustrate multi-TRP COT acquisition operations.
  • FIG. 3 illustrates a multi-TRP COT acquisition scheme 300 according to some aspects of the present disclosure.
  • the scheme 300 may be employed by BSs such as the BSs 105 and/or 202, TRPs such as the TRPs 205 and UEs such as the UEs 115 and/or 215 in a network such as the networks 100 and/or.
  • multiple TRPs may acquire COTs in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) for communications with a UE as shown in the scheme 300.
  • the x-axes represent time in some arbitrary units
  • the y-axes represent frequency in some arbitrary units.
  • the scheme 300 utilizes a coordinated start mode for multi-TRP COT acquisitions, where multiple TRPs may start LBTs at the same time and all COTs may be time-aligned.
  • a shared radio frequency band 301 is partitioned into a plurality of LBT subbands 302 (shown as 302a, 302b, 302c, ...) .
  • the LBT subbands 302 may be spaced apart from each other by a guard band 304.
  • the guard bands 304 can mitigate adjacent band interference between adjacent LBT subbands 302.
  • the frequency band 301 may be at any suitable frequencies (e.g., at about 2.4 GHz, 5 GHz, 6 GHz, 10 GHz, 30 GHz, 60 GHz or higher) .
  • the frequency band 301 may be at any suitable bandwidth (e.g., 20 MHz, 40 MHz, 80 MHz, 100 MHz or more) .
  • the frequency band 301 may have a BW of about 100 MHz and may be partitioned into about 5 LBT subbands 302 each having a BW of about 20 MHz. In some aspects, the frequency band 301 may have a BW of about 20 MHz and may be partitioned into about 5 LBT subbands 302 each having a BW of about 5 MHz.
  • the frequency band 301 may be shared by multiple network operating entities of the same radio access technologies (RATs) or different RATs. For instance, the frequency band 301 may be shared by NR-U, IEEE 802.11 wireless local area network (WLAN) or WiFi, and/or license assisted access (LAA) .
  • RATs radio access technologies
  • LAA license assisted access
  • a TRP 205a and a TRP 205b may start LBTs 330 at the same time (e.g., at time T0) .
  • the TRP 205a’s COT acquisition is shown by the reference numeral 310.
  • the TRP 205a performs an LBT 330 in each LBT subband 302 simultaneously to contend for a COT 312 in each respective LBT subband 302.
  • the LBTs 330 can be based on channel energy detection and/or signal detection as discussed above.
  • the LBTs 330 in the LBT subband 302a and 202c are successful (shown by the checkmark) , and thus the TRP 205a successfully acquires the COT 312a in LBT subband 302a and the COT 312c in the LBT subband 302c.
  • the TRP 205a fails the LBT 330 in the LBT subband 302b (shown by the cross symbol) , and thus the TRP 205a fails to acquire the COT 312b in the LBT subband 302b (as shown by the dashed outlined box) .
  • the TRP 205b’s COT acquisition is shown by the reference numeral 320.
  • the TRP 205b performs an LBT 330 in each LBT subband 302 simultaneously to contend for a COT 322 in each respective LBT subband 302.
  • the LBTs 330 in the LBT subband 302a and 202b are successful (shown by the checkmark) , and thus the TRP 205b successfully acquires the COT 322a in LBT subband 302a and the COT 322b in the LBT subband 302b.
  • the TRP 205b fails the LBT 330 in the LBT subband 302c (shown by the cross symbol) , and thus the TRP 205b fails to acquire the COT 312c in the LBT subband 302c (as shown by the dashed outlined box) .
  • the COTs 312a and 312c acquired by the TRP 205a and the COTs 322a and 322b acquired by the TRP 205b have the same COT starting time 306 (e.g., time T1) and the same COT duration 309 that ends at the same COT ending time 308 (e.g., time T2) .
  • the coordinated start mode may be suitable for use in scenarios where the TRPs are located close to each other and their transmissions may potentially block each other’s LBTs.
  • the TRP 205a may indicate the availability of the LBT subbands 302 for communications with the TRP 205a (based on LBT success) using a bitmap 314.
  • the bitmap 314 may have a bit length corresponding to the number of LBT subbands 302 in the frequency band 301.
  • Each bit in the bitmap 314 may indicate whether a corresponding subband 302 of the plurality of LBT subbands 302 is available for communicating with the TRP 205a.
  • bits b0, b1, and b2 of the bitmap 310 may indicate whether the LBT subband 302c, the LBT subband 302c, the LBT subband 302c, respectively, are available for communicating with the TRP 205a.
  • a bit-value of 1 may indicate that the TRP 205a successfully acquired a COT in the respective LBT subband 302, and thus the respective LBT subband is available for communication with the TRP 205a.
  • a bit-value of 0 may indicate that the TRP 205a failed to acquire a COT in the respective LBT subband 302, and thus the respective LBT subband is not available for communication with the TRP 205a.
  • bitmap 3114 As shown in the bitmap 314, b0 is set to a value of 1 to indicate that the LBT subband 302a is available for communication with the TRP 205a during the COT 312a, b1 is set to a value of 0 to indicate that the LBT subband 302b is unavailable for communication with the TRP 205a during the COT 312b, and b2 is set to a value of 1 to indicate that the LBT subband 302c is available for communication with the TRP 205a during the COT 312c.
  • the TRP 205b may indicate the availability of the LBT subbands 302 for communications with the TRP 205b (based on LBT success) using a bitmap 324.
  • the TRP 205b may configure the bitmap 324 using substantially similar mechanisms as the TRP 205a.
  • b0 is set to a value of 1 to indicate that the LBT subband 302a is available for communication with the TRP 205b during the COT 322a
  • b1 is set to a value of 1 to indicate that the LBT subband 302b is available for communication with the TRP 205b during the COT 322b
  • b2 is set to a value of 0 to indicate that the LBT subband 302c is unavailable for communication with the TRP 205b during the COT 322c.
  • FIG. 4 illustrates a multi-TRP COT acquisition scheme 400 according to some aspects of the present disclosure.
  • the scheme 400 may be employed by BSs such as the BSs 105 and/or 202, TRPs such as the TRPs 205 and UEs such as the UEs 115 and/or 215 in a network such as the networks 100 and/or.
  • multiple TRPs may acquire COTs in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) for communications with a UE 215 as shown in the scheme 400.
  • the x-axes represent time in some arbitrary units
  • the y-axes represent frequency in some arbitrary units.
  • the scheme 400 is described using the same frequency band structure for LBTs and the same bitmap structure for subband availability indications as in the scheme 300, and may use the same reference numerals as in FIG. 3 for simplicity’s sake.
  • the scheme 400 utilizes an unconstrained start mode for multi-TRP COT acquisitions, where multiple TRPs may start LBTs at different times and COTs acquired by different TRPs may not be time-aligned.
  • a TRP 205a and a TRP 205b may start LBTs 330 at different times.
  • the TRP 205a’s COT acquisition is shown by the reference numeral 410 similar to the TRP 205a’s COT acquisition 310 shown in FIG. 3.
  • the TRP 205a performs an LBT 330 in each LBT subband 302 simultaneously to contend for a COT 412 in each respective LBT subband 302.
  • the TRP 205a successfully acquires the COT 412a in the LBT subband 302a and the COT 412c in the LBT subband 302c.
  • the TRP 205a fails to acquire the COT 412b in the LBT subband 302b.
  • the TRP 205b’s COT acquisition is shown by the reference numeral 420.
  • the TRP 205b is not constrained to start LBTs 330 and acquire COTs 422 aligning to the LBT and/or COT timing for the TRP 205a.
  • the TRP 205b performs an LBT 330 in each LBT subband 302 simultaneously to contend for a COT 322 in each respective LBT subband 302.
  • the TRP 205b successfully acquires the COT 422a in the LBT subband 302a and the COT 422b in the LBT subband 302b, respectively.
  • the TRP 205b fails to acquire the COT 412c in the LBT subband 302c.
  • the COTs 412a and 412c acquired by the TRP 205a and the COTs 422a and 422b acquired by the TRP 205b have different COT starting time.
  • the COTs 412a and 412c acquired by the TRP 205a start at time 406 (e.g., at time T1) and the COTs 422a and 422b acquired by the TRP 205b start at time 408 (e.g., at time T3) .
  • the TRP 205a’s COTs 412a and 412c can have a different COT duration than the TRP 205b’s COTs 422a and 422b.
  • the TRP 205a’s COTs 412a and 412c may have a COT duration 407 and the TRP 205b’s COTs 422a and 422b may have a COT duration 409.
  • the COT duration 409 of the TRP 205b can different from the COT duration 407 of the TRP 205a due to different interferences experienced at the TRP 205a and the TRP 205b (e.g., from the LBTs 330 performed at different times at time T0 and T2) .
  • the TRPs 205a and 205b may independently perform LBTs to acquire a COT and schedule the UE 215 for communication in an acquired COT. Since TRPs may perform LBT at different times in the unconstrained start mode, the unconstrained start mode may be suitable for use in scenarios where the TRPs are located far apart and their transmissions may not block each other’s LBTs.
  • the TRP 205a and the TRP 205b may indicate the LBT subband availability (or the successfully acquired COT) using a bitmap 414 and a bitmap 424, respectively.
  • the TRP 205a’s bitmap 414 includes a bit b0 value of 1 indicating that the LBT subband 302a is available for communication with the TRP 205a, a bit b1 value of 0 indicating that the LBT subband 302b is unavailable for communication with the TRP 205a, and a bit b2 value of 1 indicating that the LBT subband 302c is available for communication with the TRP 205a.
  • the TRP 205b’s bitmap 424 includes a bit b0 value of 1 indicating that the LBT subband 302a is available for communication with the TRP 205b, a bit b1 value of 1 indicating that the LBT subband 302b is available for communication with the TRP 205b, and a bit b2 value of 0 indicating that the LBT subband 302c is unavailable for communication with the TRP 205b.
  • the present disclosure provides techniques to extend multi-TRP operations, such as COT-SI signaling and/or monitoring, to unlicensed deployments with the coordinated start mode (shown in FIG. 3 above) and/or the unconstrained start mode (shown in FIG. 4 above) .
  • FIG. 5 is a block diagram of an exemplary UE 500 according to some aspects of the present disclosure.
  • the UE 500 may be a UE 115 discussed above in FIG. 1 or the UE 215 discussed above in FIG. 2.
  • the UE 500 may include a processor 502, a memory 504, a multi-TRP COT module 508, a transceiver 510 including a modem subsystem 512 and a radio frequency (RF) unit 514, and one or more antennas 516.
  • RF radio frequency
  • the processor 502 may include a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 502 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 504 may include a cache memory (e.g., a cache memory of the processor 502) , random access memory (RAM) , magnetoresistive RAM (MRAM) , read-only memory (ROM) , programmable read-only memory (PROM) , erasable programmable read only memory (EPROM) , electrically erasable programmable read only memory (EEPROM) , flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 504 includes a non-transitory computer-readable medium.
  • the memory 504 may store, or have recorded thereon, instructions 506.
  • the instructions 506 may include instructions that, when executed by the processor 502, cause the processor 502 to perform the operations described herein with reference to the UEs 115 in connection with aspects of the present disclosure, for example, aspects of FIGS. 1-4 and 8-14 and 16. Instructions 506 may also be referred to as program code.
  • the program code may be for causing a wireless communication device to perform these operations, for example by causing one or more processors (such as processor 502) to control or command the wireless communication device to do so.
  • the terms “instructions” and “code” should be interpreted broadly to include any type of computer-readable statement (s) .
  • the terms “instructions” and “code” may refer to one or more programs, routines, sub-routines, functions, procedures, etc. “Instructions” and “code” may include a single computer-readable statement or many computer-readable statements.
  • the multi-TRP COT module 508 may be implemented via hardware, software, or combinations thereof.
  • the multi-TRP COT module 508 may be implemented as a processor, circuit, and/or instructions 506 stored in the memory 504 and executed by the processor 502.
  • the multi-TRP COT module 508 can be integrated within the modem subsystem 512.
  • the multi-TRP COT module 508 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 512.
  • the multi-TRP COT module 508 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-4 and 8-14 and 16.
  • the multi-TRP COT module 508 is configured to receives, from at least one of a first TRP (e.g., the TRP 205a) or a second TRP (e.g., the TRP 205b) , an indication indicating an availability of a first LBT subband of a plurality of LBT subbands (e.g., the subbands 302) in an unlicensed spectrum for communicating with the first TRP and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP.
  • a first TRP e.g., the TRP 205a
  • a second TRP e.g., the TRP 205b
  • an indication indicating an availability of a first LBT subband of a plurality of LBT subbands e.g., the subbands 302
  • the multi-TRP COT module 508 may receive, from the first TRP, first COT-SI indicating the availability of the first LBT subband for communicating with the first TRP, and receive, from the second TRP, second COT-SI indicating the availability of the second LBT subband for communicating with the second TRP.
  • the first COT-SI may include a first bitmap and a second bitmap. In the first bitmap, each bit may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP. In the second bitmap, each bit may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • each bit in the first bitmap may indicate at least one of a common COT start time or a common COT duration, as will be discussed further below with reference to FIG. 8 where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap as will be discussed further below with reference to FIG. 13 where the unconstrainted start mode is employed.
  • the multi-TRP COT module 508 may receive, from the first TRP, COT-SI indicating the availability of the first LBT subband for communicating with the first TRP and the availability of the second LBT subband for communicating with the second TRP.
  • the COT-SI may include a first bitmap and a second bitmap, where each bit in the first bitmap indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP and each bit in the second bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • each of the one or more bits in the first bitmap may indicate at least one of a common COT start time or a common COT duration as will be discussed further below with reference to FIGS. 11 and 12, respectively, where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap as will be discussed further below with reference to FIG. 14 where the unconstrainted start mode is employed.
  • the multi-TRP COT module 508 may receive, from the first TRP, first COT-SI indicating a common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband or receiving, from the second TRP, second COT-SI indicating the common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband.
  • the multi-TRP COT module 508 may receive, from the first TRP, common DCI indicating a first COT duration available for communicating with the first TRP and a second COT duration available for communicating with the second TRP.
  • the first COT duration may be different than the second COT duration.
  • the transceiver 510 may include the modem subsystem 512 and the RF unit 514.
  • the transceiver 510 can be configured to communicate bi-directionally with other devices, such as the BSs 105.
  • the modem subsystem 512 may be configured to modulate and/or encode the data from the memory 504 and/or the multi-TRP COT module 508 according to a modulation and coding scheme (MCS) , e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc.
  • MCS modulation and coding scheme
  • LDPC low-density parity check
  • the RF unit 514 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc. ) modulated/encoded data (e.g., PUSCH, PUCCH) from the modem subsystem 512 (on outbound transmissions) or of transmissions originating from another source such as a UE 115 or a BS 105.
  • the RF unit 514 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 512 and the RF unit 514 may be separate devices that are coupled together at the UE 115 to enable the UE 115 to communicate with other devices.
  • the RF unit 514 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 516 for transmission to one or more other devices.
  • the antennas 516 may further receive data messages transmitted from other devices.
  • the antennas 516 may provide the received data messages for processing and/or demodulation at the transceiver 510.
  • the transceiver 510 may provide the demodulated and decoded data (e.g., RRC configuration, PDSCH, PDCCH, multi-TRP COT-SI) to the multi-TRP COT module 508 for processing.
  • the antennas 516 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the RF unit 514 may configure the antennas 516.
  • the transceiver 510 is configured to coordinate with the multi-TRP COT module 508 to receive, from at least one of a first TRP (e.g., the TRP 205a) of a network or a second TRP (e.g., the TRP 205b) of the network, an indication indicating an availability of a first LBT subband of a plurality of LBT subbands (e.g., the subbands 302) in an unlicensed spectrum for communicating with the first TRP and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP.
  • a first TRP e.g., the TRP 205a
  • a second TRP e.g., the TRP 205b
  • the transceiver 510 is further configured to coordinate with the multi-TRP COT module 508 to communicates at least one of a first communication signal (e.g., PDCCH, PDSCH, PUSCH, and/or PUCCH) in the first LBT subband with the first TRP or a second communication signal (e.g., PDCCH, PDSCH, PUSCH, and/or PUCCH) in the second LBT subband with the second TRP.
  • a first communication signal e.g., PDCCH, PDSCH, PUSCH, and/or PUCCH
  • the UE 500 can include multiple transceivers 510 implementing different RATs (e.g., NR and LTE) .
  • the UE 500 can include a single transceiver 510 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 510 can include various components, where different combinations of components can implement different RATs.
  • FIG. 6 is a block diagram of an exemplary BS 600 according to some aspects of the present disclosure.
  • the BS 600 may be a BS 105 in the network 100 as discussed above in FIG. 1 or a BS 202 in the network 200 discussed above in FIG. 2.
  • the BS 600 may include a processor 602, a memory 604, a multi-TRP COT module 608, a transceiver 610 including a modem subsystem 612 and a RF unit 614, and one or more antennas 616. These elements may be in direct or indirect communication with each other, for example via one or more buses.
  • the processor 602 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 602 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 604 may include a cache memory (e.g., a cache memory of the processor 602) , RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 604 may include a non-transitory computer-readable medium.
  • the memory 604 may store instructions 606.
  • the instructions 606 may include instructions that, when executed by the processor 602, cause the processor 602 to perform operations described herein, for example, aspects of FIGS. 1-4 and 8-15. Instructions 606 may also be referred to as code, which may be interpreted broadly to include any type of computer-readable statement (s) as discussed above with respect to FIG. 5.
  • the multi-TRP COT module 608 may be implemented via hardware, software, or combinations thereof.
  • the multi-TRP COT module 608 may be implemented as a processor, circuit, and/or instructions 606 stored in the memory 604 and executed by the processor 602.
  • the multi-TRP COT module 608 can be integrated within the modem subsystem 612.
  • the multi-TRP COT module 608 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 612.
  • the multi-TRP COT module 608 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-4 and 8-15.
  • the multi-TRP COT module 608 is configured to transmit, via at least one of a first TRP (e.g., the TRP 205a) or a second TRP (e.g., the TRP 205b) , an indication indicating an availability of a first LBT subband of a plurality of LBT subbands (e.g., the subbbands 302) in an unlicensed spectrum for communicating with the first TRP and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP.
  • a first TRP e.g., the TRP 205a
  • a second TRP e.g., the TRP 205b
  • an indication indicating an availability of a first LBT subband of a plurality of LBT subbands e.g., the subbbands 302
  • the multi-TRP COT module 608 may transmit, via the first TRP, first COT-SI indicating the availability of the first LBT subband for communicating with the first TRP.
  • the multi-TRP COT module 608 may also transmit, via the second TRP, second COT-SI indicating the availability of the second LBT subband for communicating with the second TRP.
  • the first COT-SI may include a first bitmap and a second bitmap. In the first bitmap, each bit may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP. In the second bitmap, each bit may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • each of the one or more bits in the first bitmap may indicate at least one of a common COT start time or a common COT duration as will be discussed further below with reference to FIG. 8 where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap as will be discussed further below with reference to FIG. 13 where the unconstrainted start mode is employed.
  • the multi-TRP COT module 608 may transmit, via the first TRP or the second TRP, COT-SI indicating the availability of the first LBT subband for communicating with the first TRP and the availability of the second LBT subband for communicating with the second TRP.
  • the COT-SI may include a first bitmap and a second bitmap, where each bit in the first bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP and each bit in the second bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • each bit in the first bitmap may indicate at least one of a common COT start time or a common COT duration as will be discussed further below with reference to FIGS. 11 and 12 where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap as will be discussed further below with reference to FIG. 14 where the unconstrainted start mode is employed.
  • the multi-TRP COT module 608 may transmit, via at least first TRP, first COT-SI indicating a common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband or, via the second TRP, second COT-SI indicating the common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband.
  • the multi-TRP COT module 608 may transmit, via the first TRP, common DCI indicating a first COT duration available for communicating with the first TRP and a second COT duration available for communicating with the second TRP.
  • the first COT duration may be different than the second COT duration.
  • the transceiver 610 may include the modem subsystem 612 and the RF unit 614.
  • the transceiver 610 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or 500 and/or another core network element.
  • the modem subsystem 612 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc.
  • the RF unit 614 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • modulated/encoded data e.g., RRC configuration, PDSCH, PDCCH, multi-TRP COT-SI
  • modulated/encoded data e.g., RRC configuration, PDSCH, PDCCH, multi-TRP COT-SI
  • the RF unit 614 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 612 and/or the RF unit 614 may be separate devices that are coupled together at the BS 105 to enable the BS 105 to communicate with other devices.
  • the RF unit 614 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 616 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a camped UE 115 or 500 according to some aspects of the present disclosure.
  • the antennas 616 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 610.
  • the transceiver 610 may provide the demodulated and decoded data (e.g., PUSCH, PUCCH) to the multi-TRP COT module 608 for processing.
  • the antennas 616 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the transceiver 610 is configured to coordinate with the multi-TRP COT module 608 to transmit, via at least one of a first TRP (e.g., the TRP 205a) or a second TRP (e.g., the TRP 205b) , an indication indicating an availability of a first LBT subband of a plurality of LBT subbands (e.g., the subbbands 302) in an unlicensed spectrum for communicating with the first TRP and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP.
  • a first TRP e.g., the TRP 205a
  • a second TRP e.g., the TRP 205b
  • the transceiver 610 is further configured to coordinate with the multi-TRP COT module 608 to communicate, with a UE (e.g., the UEs 115, 215, and/or 500) , at least one of a first communication signal in the first LBT subband via the first TRP or a second communication signal in the seocnd LBT subband via the second TRP.
  • a UE e.g., the UEs 115, 215, and/or 500
  • the BS 600 can include multiple transceivers 610 implementing different RATs (e.g., NR and LTE) .
  • the BS 600 can include a single transceiver 610 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 610 can include various components, where different combinations of components can implement different RATs.
  • FIG. 7 is a block diagram of an exemplary TRP 700 according to some aspects of the present disclosure.
  • the TRP 700 may be a TRP 205 in the network 200 as discussed above in FIG. 2.
  • the TRP 700 may include a processor 702, a memory 704, a multi-TRP COT module 708, a transceiver 710 including a modem subsystem 712 and a RF unit 714, and one or more antennas 716. These elements may be in direct or indirect communication with each other, for example via one or more buses.
  • the processor 702 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 702 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 704 may include a cache memory (e.g., a cache memory of the processor 702) , RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 704 may include a non-transitory computer-readable medium.
  • the memory 704 may store instructions 706.
  • the instructions 706 may include instructions that, when executed by the processor 702, cause the processor 702 to perform operations described herein, for example, aspects of FIGS. 1-4 and 8-15. Instructions 706 may also be referred to as code, which may be interpreted broadly to include any type of computer-readable statement (s) as discussed above with respect to FIG. 5.
  • the multi-TRP COT module 708 may be implemented via hardware, software, or combinations thereof.
  • the multi-TRP COT module 708 may be implemented as a processor, circuit, and/or instructions 706 stored in the memory 704 and executed by the processor 702.
  • the multi-TRP COT module 708 can be integrated within the modem subsystem 712.
  • the multi-TRP COT module 708 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 712.
  • the multi-TRP COT module 708 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-4 and 8-15.
  • the multi-TRP COT module 708 is configured to transmit an indication indicating an availability of a first LBT subband of a plurality of LBT subbands (e.g., the subbbands 302) in an unlicensed spectrum for communicating with the first TRP.
  • the multi-TRP COT module 708 may transmit first COT-SI indicating the availability of the first LBT subband for communicating with the first TRP.
  • the first COT-SI may include a first bitmap and a second bitmap. In the first bitmap, each bit may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP.
  • the multi-TRP COT module 708 is configured to coordinate with a second TRP (e.g., the TRPs 205 and/or the TRP 700) for COT-SI signaling.
  • a second TRP e.g., the TRPs 205 and/or the TRP 700
  • the TRP 700 and the other TRP may operate in a coordinated start mode as discussed above wit reference to FIG. 3.
  • the multi-TRP COT module 708 may also indicate a common COT duration available for communicating with the TRP 700 in the first LBT subband and with the second TRP in the second LBT subband.
  • the multi-TRP COT module 708 is configured to transmit COT-SI indicating the availability of the first LBT subband for communicating with the TRP 700 and the availability of the second LBT subband for communicating with the second TRP.
  • the COT-SI may include a first bitmap and a second bitmap, where each bit in the first bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the TRP 700 and each bit in the second bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • each bit in the first bitmap may indicate at least one of a common COT start time or a common COT duration as will be discussed further below with reference to FIGS. 11 and 12 where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap as will be discussed further below with reference to FIG. 14 where the unconstrainted start mode is employed.
  • the multi-TRP COT module 708 may transmit common DCI indicating a first COT duration available for communicating with the first TRP and a second COT duration available for communicating with the second TRP.
  • the first COT duration may be different than the second COT duration.
  • the transceiver 710 may include the modem subsystem 712 and the RF unit 714.
  • the transceiver 710 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or 500 and/or another core network element.
  • the modem subsystem 712 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc.
  • the RF unit 714 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • modulated/encoded data e.g., PDSCH, PDCCH, RRC configuration, multi-TRP COT-SI
  • modulated/encoded data e.g., PDSCH, PDCCH, RRC configuration, multi-TRP COT-SI
  • the RF unit 714 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 712 and/or the RF unit 714 may be separate devices that are coupled together at the BS 105 to enable the BS 105 to communicate with other devices.
  • the RF unit 714 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 716 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a camped UE 115 or 500 according to some aspects of the present disclosure.
  • the antennas 716 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 710.
  • the transceiver 710 may provide the demodulated and decoded data (e.g., PUSCH, PUCCH) to the multi-TRP COT module 708 for processing.
  • the antennas 716 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the TRP 700 can include multiple transceivers 710 implementing different RATs (e.g., NR and LTE) .
  • the TRP 700 can include a single transceiver 710 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 710 can include various components, where different combinations of components can implement different RATs.
  • FIG. 8 illustrates a multi-TRP COT-SI signaling scheme 800 according to some aspects of the present disclosure.
  • the scheme 800 may be employed by BSs such as the BSs 105, 202, and/or 600, TRPs such as the TRPs 205 and/or 700, and UEs such as the UEs 115, 215, and/or 500 in a network such as the networks 100 and/or 200.
  • multiple TRPs may signal COT-SI in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) for communications with a UE as shown in the scheme 800.
  • the x-axes represent time in some arbitrary units
  • the y-axes represent frequency in some arbitrary units.
  • each TRP can be connected to a UE and each TRP may separately signal COT-SI to the UE.
  • the scheme 800 illustrates COT-SI signaling when the multiple TRPs utilize the coordinated start mode as discussed above with reference to FIG. 3.
  • the scheme 800 is described using the same COT acquisition scenarios as in the scheme 300, and may use the same reference numerals as in FIG. 3 for simplicity’s sake.
  • FIG. 8 illustrates the COT-SI signaling in the LBT subband 302a.
  • similar COT-SI signaling mechanisms can be applied to any LBT subband 302 with a successful COT acquisition.
  • the TRP 205a upon winning the COT 312a in the LBT subband 302a, transmits COT-SI 812 in the LBT subband 302a, for example, at the beginning of the COT 312a or any other suitable time.
  • the COT-SI 812 includes the bitmap 314 indicating LBT subbands where the TRP 205a had successfully acquired a COT 312.
  • the TRP 205b upon winning the COT 322a in the LBT subband 302a, the TRP 205b transmits COT-SI 822 in the LBT subband 302a, for example, at the beginning of the COT 322a or any other suitable time.
  • the COT-SI 822 includes the bitmap 324 indicating LBT subbands where the TRP 205b had successfully acquired a COT 322.
  • the TRP 205a and the TRP 205b transmit separate COT-SI 812 and COT-SI 822, respectively, for example, to a UE 215.
  • the COT-SI 812 and the COT-SI 822 can be transmitted in the form of DCI format 2_0, for example, via a group common-physical downlink control channel (GC-PDCCH) .
  • GC-PDCCH group common-physical downlink control channel
  • the TRP 205a may include a COT duration field 830 in the COT-SI 812.
  • the COT duration field 830 may indicate the duration (e.g., the COT duration 309) of the COT 312a.
  • the TRP 205b may also include the same COT duration field 830 in the COT-SI 822 indicating the COT duration 309 for the COT 322a.
  • a single TRP 205 from a group of TRPs 205 serving a UE e.g., the UEs 115, 215, and/or 500
  • two or more TRPs can signal the same COT duration 830 to improve robustness.
  • the UE may monitor for perform PDCCH monitoring for each TRP 205 based on a corresponding bitmap received from the respective TRP as discussed below with reference to FIG. 9.
  • the UE may combine the bitmaps received from the different TRPs 205 and perform PDDCH monitoring from each TRP 205 based on the combined bitmap as discussed below with reference to FIG. 10.
  • FIG. 9 is a flow diagram of a multi-TRP communication method 900 according to some aspects of the present disclosure. Aspects of the method 900 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as the UEs 115, 215, and/or 500, may utilize one or more components, such as the processor 502, the memory 504, the multi-TRP COT module 508, the transceiver 510, the modem 512, and the one or more antennas 516, to execute the steps of method 1300.
  • the method 900 may implemented in conjunction with the schemes 300 and 800 discussed above with respect to FIGS. 3 and 8, respectively.
  • the method 900 includes a number of enumerated steps, but aspects of the method 900 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.
  • the method 900 may be implemented when a UE (e.g., the UEs 115, 215, and/or 500) is served by multiple TRPs (e.g., the TRPs 205 and/or 700) over a shared radio frequency band (e.g., the shared radio frequency band 301) .
  • a UE e.g., the UEs 115, 215, and/or 500
  • multiple TRPs e.g., the TRPs 205 and/or 700
  • a shared radio frequency band e.g., the shared radio frequency band 301
  • the UE receives first COT-SI (e.g., the COT-SI 812) from a first TRP (e.g., the TRP 205a) .
  • the UE may utilize one or more components, such as the processor 502 or 502, the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to receive the first COT-SI.
  • first COT-SI may be transmitted in the form of DCI format 2_0.
  • the network may configure the UE with CORESETS and/or PDCCH search spaces for DCI format 2_0 monitoring in a plurality of subbands (e.g., the subbands 302) .
  • the network may configure the UE with different CORESETS and/or different PDCCH search spaces for different TRPs.
  • the UE may perform blind decoding in each of the LBT subband in corresponding PDCCH search space (s) to monitoring for DCI format 2_0.
  • the UE may receive the first COT-SI when a blind decoding is successfully.
  • the first COT-SI may include a first bitmap (e.g., the bitmap 314) , where each bit in the first bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP. Additionally, the first COT-SI may indicate a COT duration (e.g., the COT duration 309) .
  • the UE receives second COT-SI (e.g., the COT-SI 822) from a second TRP (e.g., the TRP 205b) .
  • the UE may utilize one or more components, such as the processor 502 or 502, the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to receive the second COT-SI.
  • the UE may monitor for the second COT-SI from the second TRP using substantially similar mechanisms as the monitoring for the first COT-SI from the first TRP.
  • the second COT-SI may include a second bitmap (e.g., the bitmap 324) , where each bit in the first bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP. Additionally, the second COT-SI may indicate a COT duration (e.g., the COT duration 309) .
  • the UE monitors the LBT subbands for communications from each TRP based on a corresponding bitmap.
  • the UE may utilize one or more components, such as the processor 502 or 502, the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to monitor the LBT subbands for communications from each TRP based on a corresponding bitmap.
  • the network may configure the UE with CORESETs and/or PDCCH search spaces in each LBT subbands for monitoring DCI (e.g., UL scheduling grants and/or DL scheduling grants) from the first TRP and the second TRP.
  • DCI e.g., UL scheduling grants and/or DL scheduling grants
  • the UE may perform blind decoding in each of the LBT subband in corresponding PDCCH search space (s) to monitoring for UL and/or DL scheduling grants within the indicated COT duration.
  • the UE may receive a UL scheduling grant or a DL scheduling grant from the PDCCH monitoring for communication with the first TRP and/or the second TRP.
  • the UE may skip PDCCH monitoring from the first TRP in the unavailable LBT subband during the COT duration.
  • the UE may skip PDCCH monitoring from the second TRP in the unavailable LBT subband during the COT duration.
  • a LBT subband e.g., the LBT subband 302c
  • FIG. 10 is a flow diagram of a multi-TRP communication method 1000 according to some aspects of the present disclosure. Aspects of the method 1000 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as the UEs 115, 215, and/or 500, may utilize one or more components, such as the processor 502, the memory 504, the multi-TRP COT module 508, the transceiver 510, the modem 512, and the one or more antennas 516, to execute the steps of method 1300.
  • the method 1000 may implemented in conjunction with the schemes 300 and 800 discussed above with respect to FIGS. 3 and 8, respectively.
  • the method 1000 includes a number of enumerated steps, but aspects of the method 1000 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.
  • the method 1000 may be implemented when a UE (e.g., the UEs 115, 215, and/or 500) is served by multiple TRPs (e.g., the TRPs 205 and/or 700) over a shared radio frequency band (e.g., the shared radio frequency band 301) .
  • the method 1000 includes features similar to method 900 in many respects.
  • blocks 1010 and 1020 are similar to blocks 910 and 920, and 895, respectively. Accordingly, for sake of brevity, details of those steps will not be repeated here. Please refer to the corresponding descriptions above.
  • the UE combines the first bitmap (e.g., the subband availability bitmap 314) in the first COT-SI received from the first TRP and the second bitmap (e.g., the subband availability bitmap 324) in the second COT-SI received from the second TRP.
  • the UE may utilize one or more components, such as the processor 502 or 502, the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to combine the first bitmap and the second bitmap.
  • the UE may apply a logical OR operation to the first bitmap and the second bitmap.
  • the first bitmap may indicate bit-values [1, 0, 1]
  • the second bitmap may indicate bit-values [1, 1, 0]
  • the combined bitmap may be [1, 1, 1] .
  • the UE may apply a logical AND operation to the first bitmap and the second bitmap.
  • the first bitmap may indicate bit-values [1, 0, 1]
  • the second bitmap may indicate bit-values [1, 1, 0]
  • the combined bitmap may be [1, 0, 0] .
  • the UE monitors the LBT subbands for communications from the first TRP and the second TRP based on combined bitmap.
  • the UE may utilize one or more components, such as the processor 502 or 502, the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to monitors the LBT subbands for communications from the first TRP and the second TRP based on the combined bitmap. For instance, if the OR operation is applied to generate the combined bitmap, the UE may monitor for communications from the first TRP and the second TRP in an LBT subband when either the first bitmap or the first bitmap indicates a bit-value of 1 for the respective LBT subband.
  • the UE may monitor for communications from the first TRP and the second TRP in an LBT subband when both the first bitmap and the first bitmap indicate a bit-value of 1 for the respective LBT subband.
  • the UE may employ similar PDCCH monitoring mechanisms as in block 930 to monitor for communications from the first TRP and the second TRP.
  • FIG. 11 illustrates a multi-TRP COT-SI signaling scheme 1100 according to some aspects of the present disclosure.
  • the scheme 1100 may be employed by BSs such as the BSs 105, 202, and/or 600, TRPs such as the TRPs 205 and/or 700, and UEs such as the UEs 115, 215, and/or 500 in a network such as the networks 100 and/or 200.
  • multiple TRPs may signal COT-SI in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) for communications with a UE as shown in the scheme 1100.
  • a shared radio frequency band e.g., in a shared spectrum or an unlicensed spectrum
  • the scheme 1100 illustrates COT-SI signaling when the multiple TRPs utilize the coordinated start mode as discussed above with reference to FIG. 3.
  • the scheme 1100 is described using the same COT acquisition scenarios as in the scheme 300, and may use the same reference numerals as in FIG. 3 for simplicity’s sake.
  • FIG. 11 illustrates the COT-SI signaling in the LBT subband 302a.
  • similar COT-SI signaling mechanisms can be applied to any LBT subband 302 with a successful COT acquisition.
  • one TRP from a group of TRPs serving a UE may signal COT-SI for all TRPs instead of having all TRPs to signal separate COT-SI.
  • the TRP 205a transmits COT-SI 1112 in the LBT subband 302a, for example, at the beginning of the COT 312a or any other suitable time.
  • the COT-SI 1112 may indicate a bitmap 1114 including the individual bitmap 314 (indicating LBT subbands where the TRP 205a successfully acquires a COT 312) and the individual bitmap 324 (indicating LBT subbands where the TRP 205b successfully acquires a COT 322) .
  • the bitmap 1114 may include a bitmap field indicating a concatenation of the TRP’s 205a bitmap 314 and the TRP 205b’s bitmap 324 as shown.
  • the TRP 205a may alternatively configure the bitmap 1114 to include the bitmap 314 and the bitmap 324 in any suitable arrangement.
  • the TRP 205a may additionally include a COT duration field 1130 in the COT-SI 1112. Since the TRP 205a’s COT 312a and for the TRP 205b’s COT 322a may have an identical COT duration 309, the COT duration field 1130 may indicate the COT duration both the TRP 205a’s COT 312a and for the TRP 205b’s COT 322a. In some aspects, to improve robustness, the TRP 205b may also transmit COT-SI 1122 including the COT duration field 1130 and/or the bitmap 1114. In some aspects, when the COT duration field 1130 is included in COT-SI from different TRPs, the scheme 1100 may restrict the COT duration field 1130 to indicate the same COT duration.
  • the COT-SI 1112 and/or 1122 can be transmitted in the form of DCI format 2_0 via a GC-PDCCH.
  • the UE may employ the methods 900 and/or 1000 discussed above with references to FIGS. 9 and/or 10, respectively, for communications with the TRPs.
  • FIG. 12 illustrates a multi-TRP COT-SI signaling scheme 1200 according to some aspects of the present disclosure.
  • the scheme 1200 may be employed by BSs such as the BSs 105, 202, and/or 600, TRPs such as the TRPs 205 and/or 700, and UEs such as the UEs 115, 215, and/or 500 in a network such as the networks 100 and/or 200.
  • multiple TRPs may signal COT-SI in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) for communications with a UE as shown in the scheme 1200.
  • a shared radio frequency band e.g., in a shared spectrum or an unlicensed spectrum
  • the scheme 1200 illustrates COT-SI signaling when the multiple TRPs utilize the coordinated start mode as discussed above with reference to FIG. 3.
  • the scheme 1200 is described using the same COT acquisition scenarios as in the scheme 300, and may use the same reference numerals as in FIG. 3 for simplicity’s sake.
  • FIG. 12 illustrates the COT-SI signaling in the LBT subband 302a.
  • similar COT-SI signaling mechanisms can be applied to any LBT subband 302 with a successful COT acquisition.
  • the scheme 1200 is substantially similar to the scheme 1100, where one TRP from a group of TRPs serving a UE may signal COT-SI for all TRPs. However, instead of including individual subband availability bitmaps from each TRP, a TRP in the scheme 1200 may combine subband availability bitmaps from all TRPs and signal the combined subband availability bitmap to the UE.
  • the TRP 205a combines the subband availability bitmap 314 of the TRP 205a and the subband availability bitmap 324 of the TRP 205b using a combining unit 1216 and transmit COT-SI 1212 including a combined bitmap 1214.
  • the combining unit 1216 may apply a logical OR operation to the bitmap 314 and the bitmap 324 to produce the combined bitmap 1214.
  • the TRP 205a may indicate a bit value of 1 for an LBT subband 302 when either the TRP 205a or the TRP 205b passes an LBT 330 in the LBT subband 302.
  • the combining unit 1216 may apply a logical AND operation to the bitmap 314 and the bitmap 324 to produce the combined bitmap 1214.
  • the TRP 205a may indicate a bit value of 1 for an LBT subband 302 when both the TRP 205a and the TRP 205b pass an LBT 330 in the LBT subband 302.
  • the TRP 205a may additionally include a COT duration field 1230 in the COT-SI 1212.
  • the COT duration field 1230 may indicate the COT duration 309 for the TRP 205a’s COT 312a and for the TRP 205b’s COT 322a.
  • the TRP 205b may also transmit COT-SI 1222 including the COT duration field 1230 and/or the bitmap 1214.
  • the COT-SI 1212 and/or 1222 can be transmitted in the form of DCI format 2_0 via a GC-PDCCH.
  • the UE may employ perform PDCCH monitoring as discussed above at block 1040 with reference to FIG. 10 for communications with the TRPs.
  • FIG. 13 illustrates a multi-TRP COT-SI signaling scheme 1300 according to some aspects of the present disclosure.
  • the scheme 1300 may be employed by BSs such as the BSs 105, 202, and/or 600, TRPs such as the TRPs 205 and/or 700, and UEs such as the UEs 115, 215, and/or 500 in a network such as the networks 100 and/or 200.
  • multiple TRPs may signal COT-SI in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) for communications with a UE as shown in the scheme 1300.
  • a shared radio frequency band e.g., in a shared spectrum or an unlicensed spectrum
  • the x-axes represent time in some arbitrary units, and the y-axes represent frequency in some arbitrary units.
  • multiple TRPs can be connected to a UE and each TRP may separately signal COT-SI to the UE.
  • the scheme 1300 illustrates COT-SI signaling when the multiple TRPs utilize the unconstrained start mode as discussed above with reference to FIG. 4.
  • the scheme 800 is described using the same COT acquisition scenarios as in the scheme 400, and may use the same reference numerals as in FIG. 4 for simplicity’s sake.
  • FIG. 13 illustrates the COT-SI signaling in the LBT subband 302a. However, similar COT-SI signaling mechanisms can be applied to any LBT subband 302 with a successful COT acquisition.
  • the scheme 1300 may use substantially similar COT-SI signaling mechanisms as in the scheme 800 discussed above with reference to FIG. 8.
  • the TRP 205a upon winning the COT 312a in the LBT subband 302a, the TRP 205a transmits COT-SI 1312 in the LBT subband 302a, for example, at the beginning of the COT 312a or any other suitable time.
  • the COT-SI 1312 includes the bitmap 414 indicating LBT subbands where the TRP 205a had successfully acquired a COT 412.
  • the TRP 205b transmits COT-SI 1322 in the LBT subband 302a, for example, at the beginning of the COT 322a or any other suitable time.
  • the COT-SI 1322 includes the bitmap 424 indicating LBT subbands where the TRP 205b had successfully acquired a COT 422.
  • the TRP 205a and the TRP 205b transmit separate COT-SI 1312 and COT-SI 1322, respectively, for example, to a UE 215.
  • the TRP 205a may include a COT duration field 1330 in the COT-SI 1312.
  • the COT duration field 1330 may indicate the duration (e.g., the COT duration 407) of the COT 412a.
  • the TRP 205b may also include a COT duration field 1332 in the COT-SI 1322 indicating the COT duration 409 for the COT 422a.
  • the COT-SI 1312 and the COT-SI 1322 can be transmitted in the form of DCI format 2_0, for example, via a group common-physical downlink control channel (GC-PDCCH) .
  • GC-PDCCH group common-physical downlink control channel
  • FIG. 14 illustrates a multi-TRP COT-SI signaling scheme 1400 according to some aspects of the present disclosure.
  • the scheme 1400 may be employed by BSs such as the BSs 105, 202, and/or 600, TRPs such as the TRPs 205 and/or 700, and UEs such as the UEs 115, 215, and/or 500 in a network such as the networks 100 and/or 200.
  • multiple TRPs may signal COT-SI in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) for communications with a UE as shown in the scheme 1400.
  • a shared radio frequency band e.g., in a shared spectrum or an unlicensed spectrum
  • the scheme 1400 illustrates COT-SI signaling when the multiple TRPs utilize the unconstrained start mode as discussed above with reference to FIG. 4.
  • the scheme 1400 is described using the same COT acquisition scenarios as in the scheme 400, and may use the same reference numerals as in FIG. 4 for simplicity’s sake.
  • FIG. 14 illustrates the COT-SI signaling in the LBT subband 302a.
  • similar COT-SI signaling mechanisms can be applied to any LBT subband 302 with a successful COT acquisition.
  • the TRP 205b transmits COT-SI 1412 in the LBT subband 302a, for example, at the beginning of the COT 412a or any other suitable time.
  • the COT-SI 1422 may indicate include the TRP 205a’s bitmap 414 (indicating LBT subbands where the TRP 205a successfully acquires a COT 412) and the TRP 205b’s bitmap 424 (indicating LBT subbands where the TRP 205b successfully acquires a COT 422) .
  • the COT-SI 1422 may include one bitmap field for indicating the TRP 205a’s bitmap 414a and another bitmap field for indicating the TRP 205b’s bitmap 424a.
  • the TRP 205b may include a COT duration field 1430 and a COT duration field 1432 in the COT-SI 1422.
  • the COT duration field 1430 may indicate the duration (e.g., the COT duration 407) of the TRP 205a’s COT 412a.
  • the COT duration field 1432 may indicate the duration (e.g., the COT duration 409) of the TRP 205b’s COT 422a.
  • a COT duration field may also indicate that a COT is not available for communication with a certain TRP by indicating a particular value (e.g., a value of -1) .
  • the TRP 205a may also transmit COT-SI 1412 indicating COT information specific to the COT 412a.
  • the COT-SI 1412 and/or 1422 can be transmitted in the form of DCI format 2_0 via a GC-PDCCH.
  • the schemes 800 and 1300 where each TRP (e.g., the TRPs 205 and/or 700) separately signals a corresponding subbband available bitmap (e.g., the bitmaps 314, 324, 414, and/or 424) and/or COT duration (e.g., the COT durations 309, 407, and/or 409) , may be suitable in a deployment where the TRPs are connected via a non-ideal backhaul, which may have a significant delay, some errors, and/or a low throughput.
  • each TRP e.g., the TRPs 205 and/or 700
  • a corresponding subbband available bitmap e.g., the bitmaps 314, 324, 414, and/or 424
  • COT duration e.g., the COT durations 309, 407, and/or 409
  • the schemes 1100, 1200, and 1400 where one TRP from a group of TRPs may signal subbband availability bitmaps and/or COT durations for multiple TRPs in the group (via a combined subbband availability bitmap for all TRPs or the inclusion of an individual subbband availability bitmap for each TRP) , may be suitable in a deployment where the TRPs are connected via an ideal backhaul with a low delay, high throughput, and/or no error.
  • FIG. 15 is a flow diagram of a wireless communication method 1500 according to some aspects of the present disclosure. Aspects of the method 1500 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as the BSs 105, 202, and/or 600 and/or the TRPs 205 and/or 700, may utilize one or more components, such as the processor 602 or 702, the memory 604 or 704, the multi-TRP COT module 608 or 708, the transceiver 610 or 710, the modem 612 or 712, and the one or more antennas 616 or 716, to execute the steps of method 1500.
  • the method 1500 may employ similar mechanisms as in the schemes 300, 400, 800, 1100, 1200, 1300, and/or 1400 discussed above with respect to FIGS. 3, 4, 8, 11, 12, 13, and/or 14, respectively. As illustrated, the method 1500 includes a number of enumerated steps, but aspects of the method 1500 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.
  • a first TRP e.g., the TRP 205a
  • a second TRP e.g., the TRP 205b
  • the first TRP and/or the second TRP may utilize one or more components, such as the processor 602 or 702, the multi-TRP COT module 608 or 708, the transceiver 610 or 710, the modem 612 or 712, and/or the one or more antennas 616 or 716, to transmit the indication indicating the availability of the first LBT subband for communicating with the first TRP and the availability of a second LBT subband for communicating with the second TRP.
  • the processor 602 or 702 the multi-TRP COT module 608 or 708, the transceiver 610 or 710, the modem 612 or 712, and/or the one or more antennas 616 or 716
  • the transmitting the indication may include the first TRP transmitting first COT-SI indicating the availability of the first LBT subband for communicating with the first TRP.
  • the transmitting the indication may also include the second TRP transmitting second COT-SI indicating the availability of the second LBT subband for communicating with the second TRP.
  • the first COT-SI and the second COT-SI may be similar to the COT-SI 812, 822, 1312, and/or 1322.
  • the first COT-SI may include a first bitmap and a second bitmap. In the first bitmap, one or more bits may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP.
  • one or more bits may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • the first bitmap and the second bitmap may be similar to the bitmaps 314, 324, 414, and/or 424.
  • each of the one or more bits in the first bitmap may indicate at least one of a common COT start time or a common COT duration, for example, as shown in the scheme 800 discussed above with reference to FIG. 8 where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap, for example, as shown in the scheme 1300 discussed above with reference to FIG. 13 where the unconstrainted start mode is employed.
  • the transmitting the indication may include the first TRP transmitting COT-SI (e.g., the COT-SI 1112, 1212, and/or 1422) indicating the availability of the first LBT subband for communicating with the first TRP and the availability of the second LBT subband for communicating with the second TRP.
  • the COT-SI may include a first bitmap and a second bitmap, where one or more bits in the first bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP and one or more bits in the second bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • each of the one or more bits in the first bitmap may indicate at least one of a common COT start time or a common COT duration, for example, as shown in the schemes 1100 and 1200 discussed above with reference to FIGS. 11 and 12, respectively, where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap, for example, as shown in the scheme 1400 discussed above with reference to FIG. 14 where the unconstrainted start mode is employed.
  • the transmitting the indication may include at least one of first TRP transmitting first COT-SI indicating a common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband or the second TRP transmitting second COT-SI indicating the common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband.
  • the transmitting the indication may include the first TRP transmitting common DCI indicating a first COT duration available for communicating with the first TRP and a second COT duration available for communicating with the second TRP.
  • the first COT duration may be different than the second COT duration.
  • the first LBT subband and the second LBT subband may correspond to a same subband. In some aspects, the first LBT subband and the second LBT subband may be different subbands.
  • At block 1520 at least one of the first TRP communicates a first communication signal in the first LBT subband with a UE or the second TRP communicates a second communication signal in the second LBT subband with the UE.
  • the first TRP may utilize one or more components, such as the processor 602 or 702, the multi-TRP COT module 608 or 708, the transceiver 610 or 710, the modem 612 or 712, and/or the one or more antennas 616 or 716, to communicate the first communication signal in the first LBT subband with the UE.
  • the second TRP may utilize one or more components, such as the processor 602 or 702, the multi-TRP COT module 608 or 708, the transceiver 610 or 710, the modem 612 or 712, and/or the one or more antennas 616 or 716, to communicate the second communication signal in the second LBT subband with the UE.
  • the processor 602 or 702 the multi-TRP COT module 608 or 708, the transceiver 610 or 710, the modem 612 or 712, and/or the one or more antennas 616 or 716, to communicate the second communication signal in the second LBT subband with the UE.
  • FIG. 16 is a flow diagram of a wireless communication method 1600 according to some aspects of the present disclosure. Aspects of the method 1600 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as the UEs 115, 215, and/or 500, may utilize one or more components, such as the processor 502, the memory 504, the multi-TRP COT module 508, the transceiver 510, the modem 512, and the one or more antennas 516, to execute the steps of method 1600.
  • the method 1500 may employ similar mechanisms as in the schemes 300, 400, 800, 1100, 1200, 1300, and/or 1400 discussed above with respect to FIGS. 3, 4, 8, 11, 12, 13, and/or 14, respectively, and/or the methods 900 and/or 1000 discussed above with respect to FIGS. 9 and 10, respectively.
  • the method 1600 includes a number of enumerated steps, but aspects of the method 1600 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.
  • a UE receives, from at least one of a first TRP (e.g., the TRP 205a) of a network or a second TRP (e.g., the TRP 205b) of the network, an indication indicating an availability of a first LBT subband of a plurality of LBT subbands (e.g., the subbands 302) in an unlicensed spectrum for communicating with the first TRP and an availability of a second LBT subband of the plurality of LBT subbands for communicating with the second TRP.
  • a first TRP e.g., the TRP 205a
  • a second TRP e.g., the TRP 205b
  • the UE may utilize one or more components, such as the processor 502, the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to transmit the indication indicating the availability of the first LBT subband for communicating with the first TRP and the availability of a second LBT subband for communicating with the second TRP.
  • the processor 502 the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to transmit the indication indicating the availability of the first LBT subband for communicating with the first TRP and the availability of a second LBT subband for communicating with the second TRP.
  • the receiving the indication may include receiving, from the first TRP, first COT-SI indicating the availability of the first LBT subband for communicating with the first TRP.
  • the receiving the indication may also include receiving, from the second TRP, second COT-SI indicating the availability of the second LBT subband for communicating with the second TRP.
  • the first COT-SI and the second COT-SI may be similar to the COT-SI 812, 822, 1312, and/or 1322.
  • the first COT-SI may include a first bitmap and a second bitmap. In the first bitmap, one or more bits may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP.
  • one or more bits may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • the first bitmap and the second bitmap may be similar to the bitmaps 314, 324, 414, and/or 424.
  • each of the one or more bits in the first bitmap may indicate at least one of a common COT start time or a common COT duration, for example, as shown in the scheme 800 discussed above with reference to FIG. 8 where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap, for example, as shown in the scheme 1300 discussed above with reference to FIG. 13 where the unconstrainted start mode is employed.
  • the receiving the indication may include receiving, from the first TRP, COT-SI (e.g., the COT-SI 1112, 1212, and/or 1422) indicating the availability of the first LBT subband for communicating with the first TRP and the availability of the second LBT subband for communicating with the second TRP.
  • the COT-SI may include a first bitmap and a second bitmap, where one or more bits in the first bitmap indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the first TRP and one or more bits in the second bitmap may indicate whether a corresponding subband of the plurality of LBT subbands is available for communicating with the second TRP.
  • each of the one or more bits in the first bitmap may indicate at least one of a common COT start time or a common COT duration, for example, as shown in the schemes 1100 and 1200 discussed above with reference to FIGS. 11 and 12, respectively, where the coordinated start mode is employed.
  • a first bit corresponding to the first LBT subband in the first bitmap may indicate at least one of a different COT start time or a different COT duration than a second bit corresponding to the second LBT subband in the second bitmap, for example, as shown in the scheme 1400 discussed above with reference to FIG. 14 where the unconstrainted start mode is employed.
  • the receiving the indication may include receiving, from the first TRP, first COT-SI indicating a common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband or receiving, from the second TRP, second COT-SI indicating the common COT duration available for communicating with the first TRP in the first LBT subband and with the second TRP in the second LBT subband.
  • the receiving the indication may include receiving, from the first TRP, common DCI indicating a first COT duration available for communicating with the first TRP and a second COT duration available for communicating with the second TRP.
  • the first COT duration may be different than the second COT duration.
  • the first LBT subband and the second LBT subband may correspond to a same subband. In some aspects, the first LBT subband and the second LBT subband may be different subbands.
  • the UE communicates at least one of a first communication signal in the first LBT subband with the first TRP or a second communication signal in the second LBT subband with the second TRP.
  • the UE may utilize one or more components, such as the processor 502, the multi-TRP COT module 508, the transceiver 510, the modem 512, and/or the one or more antennas 516, to communicate at least one of the first communication signal in the first LBT subband with the first TRP or the second communication signal in the second LBT subband with the second TRP.
  • the UE may further determine a subband availability for the first LBT subband by combining the first bitmap and the second bitmap and monitor for the first communication signal in the first LBT subband based on the determined subband availability, for example, as discussed in the method 1000 with reference to FIG. 10.
  • the UE may further determine the subband availability for the first LBT subband comprises applying an OR operation or an AND operation to the first bitmap and the second bitmap, for example, as discussed in the method 1000 with reference to FIG. 10.
  • Information and signals may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • “or” as used in a list of items indicates an inclusive list such that, for example, a list of [at least one of A, B, or C] means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .

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Abstract

L'invention concerne des systèmes et des procédés de communications sans fil associés à des opérations de multiples points d'émission-réception (multi-TRP) dans un spectre partagé ou dans un spectre sans licence. Un système de réseau comprend un premier point d'émission-réception (TRP) et un second TRP. Le premier TRP et/ou le second TRP émet une indication indiquant une disponibilité d'une première sous-bande à écoute avant émission (LBT) d'une pluralité de sous-bandes LBT dans un spectre sans licence pour communiquer avec le premier TRP ; et une disponibilité d'une seconde sous-bande LBT de la pluralité de sous-bandes LBT pour communiquer avec le second TRP. Le premier TRP communique, avec un équipement utilisateur (UE), un premier signal de communication dans la première sous-bande LBT et/ou le second TRP communique, avec l'UE, un second signal de communication dans la seconde sous-bande LBT.
PCT/CN2020/075240 2020-02-14 2020-02-14 Informations de structure temporelle d'occupation de canal (cot-si) pour de multiples points d'émission-réception (trps) WO2021159456A1 (fr)

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